rudiments vs bedrock

rudiments and bedrock both are nouns.

Word	Noun	Adjective	Verb	Adverb
rudiments	Yes	No	No	No
bedrock	Yes	No	No	No

As nouns, bedrock is a hypernym of rudiments; that is, bedrock is a word with a broader meaning than rudiments:

Other hypernyms of rudiments include basic principle, basics, fundamental principle, fundamentals.

rudiments (noun)	bedrock (noun)
the elementary stages of any subject (usually plural)	principles from which other truths can be derived
a statement of fundamental facts or principles	solid unweathered rock lying beneath surface deposits of soil